AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in May 2026 (see full year).
One-Way flights
| 13 May | Aer Lingus | ||
| 06 May | Royal Air Maroc | ||
| 19 May | Aer Lingus | ||
| 11 May | Turkish Airlines | ||
| 06 May | TAP | direct | |
| 13 May | TAP | direct | |
| 19 May | TAP | direct | |
| 18 May | Lufthansa | direct | |
| 11 May | Lufthansa | direct |
Also check the deals for return flights from Washington to Lisbon in May.
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